Glass-blowing tube



A. P1 GLASS BLG (No Model.)

TMAN. WING TUBE.

No'. 444,160. Patented JaIL, 1891.

Q- 15111141111111115151 K Illllllll I NVENTEIR WITNEEEEE UNITED STATES PATENT OFFICE.

AARON PITMAN, OF MATAVAN, NEW JERSEY.

GLASS-BLOWING TUBE.

SPECIFICATION forming part of Letters Patent No. 444,160, dated January 6, 1891.

Application tiled May 24, 1890.

To all whom t may concern.-

Be it known that I, AARON PITMAN, of Matawan, Monmouth county, New Jersey, have invented an Improved Glass-Blowing Tube, ot' which the following is a specification.

This invent-ion Vrelates to a glass-blowei"s tube so constructed that metallic oxide will not be formed at the end of the tube thrust into the glass-pot- Usually this metallic oxide forms owing to the high temperature to which the tube is subjected and is absorbed in part by the glass. This not only uses up the tube, but it also injuriously affects the glass. By my invention no metallic oxide or moiles is formed.

The invention consists in the various features of improvement more fully pointed out in the claims.

In the accompanying drawings, Figure 1 is a longitudinal central section through one end of my improved glass-blowing tube. Fig. 2 is an enlarged cross-section on the line a", Fig. l.

The letter a represents a glass-blowei"s tube having a screw-tapped socket a at one end. Into this socket there is screwed a nozzle Z9, which is adapted to be dipped into the viscid glass. The nozzle b is made non-oxidizable either by being coated with an electrolytic deposit of platinum or by heilig composed of a non-oxidizable alloy.

The alloy I prefer to use for making the nozzle h consists of about forty parts of copper, forty parts of nickel, ten parts of aluminum, and ten parts of platinum.

The bore of nozzle b is greater than the bore of the tube ct, and into the bore of the nozzle there is slipped a platinum tube c, as shown. This tube c is Withdrawn from time to time and steeped in powdered graphite a, Which will adhere sufficient-ly to the surfaces of the tube. The tube c thus prepared is placed into the bore of the nozzle, when it will constitute a continuation of the bore of tube a.. A binding-screw e serves to hold tube c in place.

The object of the coated inner tube c is to prevent oxidation or adherence ot that part ot' the glass that enters the mouth of the nozzle. In Fig. 2, which is greatly exaggerated, the graphite coating is visible, While in Fig. l, which is on a natural scale, such coatingis not perceptible.

A blow-tube made according to my invention will be serviceable tor an indefinite length of time and will produce clean Work.

What I claim is- 1. A glass-blowers tube provided with a nozzle and an inner tube Within saidv nozzle, substantially as specified.

2. A glass-blowers tube provided with a nozzle, a tube within the'nozzle, and agraphite coating upon the tube, substantially as specified.

A. PITMAN.

Vitnesses:

F. v. BRIESEN, A. JoNGHMANs. 

